package Main.day10_13;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;

/**
 * @auther hewenhui
 * @see <a href="hetp://www.codingmaster.com> java </a>
 */
public class test1 {
    public static void main(String[] args) {
        int heelo$word=4;
//        int heelo*word=4;  这个命名不行

        HashMap<String,String> map = new HashMap<>();
        map.put("name",null);
        map.put("name","tom");

        System.out.println(map.size());
        List<Integer> list = new ArrayList<>();

        int a=0;
        int b=0;


    }
}
